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Derivative Instruments and Hedging Activities - Effect of Gains (Losses) on Cross Currency Swaps (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Total realized and unrealized losses on cross currency swaps $ (6,548) $ (2,195) $ 13,431
Cross Currency Interest Rate Contract Maturity and Partial Termination [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Realized (loss) gain on maturity and partial termination of cross currency swaps (41,707) (36,155) 0
Cross Currency Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Total realized and unrealized losses on cross currency swaps (5,238) (144,306) (171,289)
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Derivative Instruments, Gain (Loss) [Line Items]      
Total realized and unrealized losses on cross currency swaps (38,564) (18,973) (3,955)
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Derivative Instruments, Gain (Loss) [Line Items]      
Total realized and unrealized losses on cross currency swaps $ 75,033 $ (89,178) $ (167,334)